Re: Git help please - checking out old commit doesn't find lib/gnulib.mk.in.

[Óscar Fuentes]

Stefan Monnier <address@hidden> writes:

>>> Why can Emacs not have a reliable way of cleaning up configuration and
>>> build products (and _only_ these) such that a clean build can then be
>>> done?
>> How the Emacs build system could know the products generated of the
>> future? Because this is the problem you faced.
>
> We don't need to solve this impossible problem.
> Instead we just need to make a rule in GNUmakefile (which is not
> autoconf-generated contrarily to Makefile) to remove all the
> auto-generated files of the present.

This works as long as we remember to remove the build products *before*
we switch to another revision and then perform a full rebuild. A bit
draconian.